Abstract
The use of urea and two slow release nitrogen fertilisers to manipulate pasture botanical composition and increase dry matter production after pasture establishment or renovation was investigated in 5 trials in Northland, New Zealand. Seven bimonthly applications of urea (50 kg N/ha/application) after pasture establishment on an undeveloped podzol increased dry matter production by 41%. The percent legume in pasture was reduced by nitrogen, but returned to a level similar to control when applications of nitrogen ceased. Lotus pedunculatus L. was a useful colonising plant for acid podzols, providing a more rapid ground cover and higher early dry matter production than Trifolium repens L. but it did not persist under the grazing regime used. Nitrogen fertiliser applied during pasture renovation increased dry matter production, nitrogen applied 2 weeks after pasture emergence producing the largest dry matter response of the single applications investigated. Multiple 50 kg N/ha applications were superior to 25 kg N/ha applications. Two slow release fertilisers tested (Isobutylidene diurea and Organiform) were no better than urea. Although nitrogen suppressed legume growth, pastures reverted to legume dominance when nitrogen applications ceased.
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Claims 9
Claim · model-written summary
Seven bimonthly applications of urea at 50 kg N/ha/application after pasture establishment on an undeveloped podzol increased dry matter production by 41%.
- Taxon
- pasturee0
- Treatment
- Seven bimonthly applications of urea (50 kg N/ha/application)e0
- Outcome
- dry matter productione0
- Direction
- increasede0
- Value
- 41%e0
Not reportedComparator
Verbatim
e0“Seven bimonthly applications of urea (50 kg N/ha/application) after pasture establishment on an undeveloped podzol increased dry matter production by 41%”
Claim · model-written summary
The percent legume in pasture was reduced by nitrogen.
Not reportedComparator
Verbatim
e0“The percent legume in pasture was reduced by nitrogen”
Claim · model-written summary
The percent legume in pasture returned to a level similar to the control when nitrogen applications ceased.
Verbatim
e0“The percent legume in pasture was reduced by nitrogen, but returned to a level similar to control when applications of nitrogen ceased”
Claim · model-written summary
Lotus pedunculatus was a useful colonising plant for acid podzols, giving more rapid ground cover and higher early dry matter production than Trifolium repens.
- Taxon
- Lotus pedunculatus L.
Lotus pedunculatuse0 - Outcome
- more rapid ground cover and higher early dry matter productione0
- Direction
- highere0
- Comparator
- Trifolium repens L.e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lotus pedunculatus L. was a useful colonising plant for acid podzols, providing a more rapid ground cover and higher early dry matter production than Trifolium repens L.”
Claim · model-written summary
Lotus pedunculatus did not persist under the grazing regime used.
- Taxon
- Lotus pedunculatus L.Lotus pedunculatuse0
- Treatment
- grazing regime usede1
- Outcome
- did not persiste1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lotus pedunculatus L.”
e1“it did not persist under the grazing regime used”
Claim · model-written summary
Nitrogen fertiliser applied during pasture renovation increased dry matter production.
- Taxon
- pasturee0
- Treatment
- Nitrogen fertiliser applied during pasture renovatione0
- Outcome
- dry matter productione0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Nitrogen fertiliser applied during pasture renovation increased dry matter production”
Claim · model-written summary
Nitrogen applied 2 weeks after pasture emergence produced the largest dry matter response of the single applications investigated.
Verbatim
e0“nitrogen applied 2 weeks after pasture emergence producing the largest dry matter response of the single applications investigated”
Claim · model-written summary
Multiple 50 kg N/ha applications were superior to 25 kg N/ha applications.
Verbatim
e1“pasture botanical composition”
e2“Multiple 50 kg N/ha applications were superior to 25 kg N/ha applications”
Claim · model-written summary
Two slow release fertilisers (Isobutylidene diurea and Organiform) were no better than urea.
Verbatim
e1“pasture botanical composition”
e2“Two slow release fertilisers tested (Isobutylidene diurea and Organiform) were no better than urea”
The same questions in other papers
nitrogen · yield · Lotus pedunculatusPositive and negative results
1 in the opposite direction
- negative
fertilization · yield · Lotus pedunculatusResults agree
2 papers in the same direction as this paper
- positive
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.